+0  
 
0
240
4
avatar+2509 

Help.

NotSoSmart  Sep 19, 2017
 #1
avatar+87635 
+1

y -100x  = 200

 

Ih he sells no computers, x  =0  .....so....

 

y  - 100 (0)  = 2000

 

y  = 2000

 

 

3x  - 3y   = 15          divide through by 3

 

x  - y  = 5             add y to both sides  and subtract 5 from both sides

 

x - 5  = y

 

 

Associative property

 

 

cool cool cool

CPhill  Sep 19, 2017
 #2
avatar+2509 
0

so number 4 would be A?? or am i reading it backwards and it should be C??

NotSoSmart  Sep 19, 2017
 #3
avatar+87635 
+2

Yep...."A"

 

Note that "C" isn't correct....if it was, we would have that

 

y  = 5 - x      add x to  both sides

 

y + x  = 5        rearrange

 

x + y  = 5        multiply through by 3

 

3x + 3y  = 15     and this isn't equivalent to  3x  -3y  = 15

 

 

cool cool cool

CPhill  Sep 19, 2017
 #4
avatar+2509 
+1

ok thanks!!

NotSoSmart  Sep 19, 2017

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